Formative Practice 10.7 (Form 4 Biology Textbook Exercise and Answer)

Question 1:
Name the two main lymphatic vessels.

Right lymphatic duct and thoracic duct

Question 2:
State three main functions of the lymphatic system.

The lymphatic system has three main functions:
• The collection of excess tissue fluid to be returned to the bloodstream
• The transport of lipids from the small intestine to the bloodstream
• Body defence: Lymph nodes destroy pathogens and produce lymphocytes

Question 3:
State the differences between the composition of blood plasma, tissue fluid and lymph.


Question 4:
After eating fatty food, the number of lipid molecules in the lymph increases by 1%.
Explain why.

Fatty acids and glycerol (the digested fat-rich foods) diffuse into the lacteals in the villi of small intestines. These simple molecules then form a part of lymphatic components that are transported to the lymphatic vessel through the lacteal. Therefore, the number of lipid molecules in the lymph increases after a fat-rich meal intake.

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